Diverging jet-cutting tip for cutting torches and method of using same



Feb. 3, 1931. c. J. COBERLY 1,791,159

DIVERGING JET CUTTING TIP FOR CUTTING TORCHES AND METHOD OF USING SAME 1 Filed Sept. 29, 1925 m I I /Z 1 v V //Vl/E.'/ TO/:

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Patented Feb. 3, 1 931 UNITED STATES CLABEN'CEJ. COIBEBLY, 0] L08 ANGELEB, I

01' LO AJ N'GELES, CALIFORNIA, A CORPORA- MESNE ASSIGNMENTS, 'ro xonn, ma, new or cnnmomua PATENT oFmca cnmoimm, assieuoa BY manor ms mmeme JET-CUTTING m son cumme 'roncnns mom-men or name" em 'Appncaflon am September 29, 1923. Serial No. seam.

should be .028 inch in diameter. An oxygen My invention relates to the art of cutting slots in metal plates and is particularly aplicable to cutting slots in oil well casing.

t is generally necessary in the production of oil to rovide a steel casing or pipe which extends rom the surface of the earth'down into the oil sands,and which is erforated where it extends into the oil san s to allow the oil to ass therethrough, the erforations being s ciently small to exclu e the coarse sand and ravel surroundin the casing. It has been oun that oil wel casin can be economically p rforated by means 0 an oxygen cutting torch, before being placed in the well. It has also been found that it is highly desirable that the slots cut in the casing be of a ke stone-shaped section. That is to say that t e slots be narrower at the outer surface of the pipe than at the inner.

It is an object of my invention to provide a peculiar formof cutting tip and a new method by which keystone-shaped slots can be roduced in oil well casing.

urther objects and advantages will be made evident hereinafter. Referring to the drawing which is for illustrative purposes only,

Fig. 1 is a cross section of a cutting tip ada ted to carry on my invention.

2 is a cross section on a plane represented by the line 2-2 of Fig. 1.

, di it? is a cross section of the slot promy invention.

' In the form of the inventionillustrated in the drawing, a ti 10 is provided having a conical head'll a apted to be secured in the cutting torch in the usual manner. Mixed as onfices 12 are provided, these. orifices be-.

mg supplied with a mixture of oxygen and some combustible as. central oxygen opening 13 is provi ed, th1s o 'ening consisting of a counterbored portion into which two divergent orifices l4 and 15 are drilled The dimensions of the various parts are somewhat important and when cutting slots 3/ 32 of an inch in thickness on the top and 9/64 of an inch in thickness on the. bottom in 7/16 inch material, the dimensions should be as follows: the angle B should preferably be 7 degrees and the orifices 14 and 15 peressure of 110 pounds per square inch should used. When-atip of this description is operated on 7 /16 inch material, it produces a slot having approximately'the dimensions and shape shown in Fig. 3.

The action of the tip is as follows: the jets produced by the orifices 14 and 15'being divergent, form afan-shaped jet having its greatest 1 width along line H which extends transversely across the desired slot at right angles thereto. The spreading action 0 the jets tends to cut away the slot in the formshown in Fig. 3, and if the tip 10 is moved along the material at a substantially. uniform speed, it is possible to cut a slot of the form shown in Fig. ,3 of substantially uniform cross section and at a very low cost of operation.

The form of slot shown in Fig. 3 is particularly valuable in oil well work, since the walls 20 and 21 are inclined to each other. Any material entering the slot through the outer narrow opening will pass entirely through the slot without stopping and cloggin same.

'By forming the slots with a jet of efinite form, it is possible to form a slot of uniform width and form throughout its length.

I have found that by-cuttin slots by my method, not only is a very uni orm slot pro duced, but the action of the cuttin jet hardens the surface of the metal an increases its strength. 7

I claim as'my invention: i

1. A process of cutting slots in metal which comprises: passing a plurality of oxygen jets through said metal, said jets being projected in close relationship and directed correlatively to intersect a line on the surface of said metal, which line is transversely dis posed relative to the longitudinal axis of said slot.

Toy the feet that seid jets ene mutually diverging as they progress foiwsidiy.

process of cutting keystone-shaped slots in metal which comprises: passing e fsin sheped cutting jet through said Kristel,-

said jet diverging toward the metal.

5. A process of cutting keystone-shaped slots-in metal which comprises: passing :1 fen-shaped cutting jet through said meted, said jet being formed by s piui'elity of diverging jets and moving saidten-shaped jet along the axis of a proposed slot.

6" A process of cutting slots in meted which consists in forming a, plurality of oxygen jets tying practically in the same iene which plane istransvei'sely disposed re ative to the longitudinal axis of the desired slot, directing said 'ets into said metei, said jets diverging i'om each other as they intersect the surface of said metal, and moving said jets in a direction parallel with said axis.

In testimon whereof, I have hereunto set.

my hand at 05 Angeles, @elifornie, this th day of Septenriher. 1928.

CLARENCE J. CGBERLY.

memes 

